Prime and Composite Review

Front

What is a prime number?

Back

A prime number is a whole number greater than 1 that has exactly two distinct positive divisors: 1 and itself.

Tags

CCSS.4.OA.B.4

Front

What is a composite number?

Back

A composite number is a whole number greater than 1 that has more than two positive divisors.

Tags

CCSS.4.OA.B.4

Front

Is the number 1 prime or composite?

Back

Neither; 1 is not considered a prime or composite number.

Tags

CCSS.4.OA.B.4

Front

List the first five prime numbers.

Back

2, 3, 5, 7, 11.

Tags

CCSS.4.OA.B.4

Front

What is the smallest prime number?

Back

The smallest prime number is 2.

Tags

CCSS.4.OA.B.4

Front

Is the number 4 prime or composite?

Back

Composite; it has divisors 1, 2, and 4.

Tags

CCSS.4.OA.B.4

Front

Is the number 9 prime or composite?

Back

Composite; it has divisors 1, 3, and 9.

Tags

CCSS.4.OA.B.4

Front

What is the prime factorization of 18?

Back

2 x 3 x 3 or 2 x 3^2.

Front

Which of the following numbers is prime: 15, 17, 21?

Back

17 is prime; 15 and 21 are composite.

Tags

CCSS.4.OA.B.4

Front

How can you determine if a number is prime?

Back

A number is prime if it has no divisors other than 1 and itself.

Tags

CCSS.4.OA.B.4